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The 3 concepts are Simplicity,Universal, and Noticing.

2. "No curtain. No scenery." This shows all three concepts.

Simplicity because the stage is bare and does not rely on special effects.

Universal because people are required to use their imaginations, which is something everyone has.

Noticing because this bare stage forces you to pay attention to words, actions, and

relationships. You notice more things because there are no distractions.